This DP-900 practice question tests your understanding of identify considerations for relational data on azure. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses Azure SQL Database and needs to implement data masking for sensitive columns like email addresses and credit card numbers, so that only authorized users can see the actual data. Which feature should they configure?
Row-Level Security
Why wrong: Row-Level Security restricts row access, not column masking.
Dynamic Data Masking
Dynamic Data Masking hides sensitive data from unauthorized users.
Auditing
Why wrong: Auditing tracks activities, not masking.
Transparent Data Encryption (TDE)
Why wrong: TDE encrypts at rest, not in query results.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Dynamic Data Masking
Option B is correct because Dynamic Data Masking obfuscates sensitive data in query results for unauthorized users. Option A is wrong because Transparent Data Encryption encrypts data at rest, not in query results. Option C is wrong because Row-Level Security restricts row access but does not mask columns. Option D is wrong because Azure SQL Database Auditing tracks database events, not masking.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Row-Level Security
Why it's wrong here
Row-Level Security restricts row access, not column masking.
Dynamic Data Masking
Why this is correct
Dynamic Data Masking hides sensitive data from unauthorized users.
Related concept
CIDR notation defines the prefix length.
Auditing
Why it's wrong here
Auditing tracks activities, not masking.
Transparent Data Encryption (TDE)
Why it's wrong here
TDE encrypts at rest, not in query results.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DP-900 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Identify considerations for relational data on Azure — This question tests Identify considerations for relational data on Azure — CIDR notation defines the prefix length..
The correct answer is: Dynamic Data Masking — Option B is correct because Dynamic Data Masking obfuscates sensitive data in query results for unauthorized users. Option A is wrong because Transparent Data Encryption encrypts data at rest, not in query results. Option C is wrong because Row-Level Security restricts row access but does not mask columns. Option D is wrong because Azure SQL Database Auditing tracks database events, not masking.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DP-900 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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